Name: dotty-example-project
Owner: Programming Methods Laboratory EPFL
Description: An example sbt project that compiles using Dotty
Created: 2015-12-30 22:48:24.0
Updated: 2018-05-12 19:49:42.0
Pushed: 2018-05-06 11:06:49.0
Homepage: null
Size: 48
Language: Scala
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This is a normal sbt project, you can compile code with sbt compile and run it
with sbt run, sbt console will start a Dotty REPL.
If compiling this example project fails, you probably have a global sbt plugin
that does not work with dotty, try to disable all plugins in
~/.sbt/1.0/plugins and ~/.sbt/1.0.
Dotty comes built-in with IDE support, to try it out see http://dotty.epfl.ch/docs/usage/ide-support.html
The fastest way to start a new Dotty project is to use one of the following templates:
You will need to make the following adjustments to your build:
btPlugin("ch.epfl.lamp" % "sbt-dotty" % "0.2.2")
version=1.1.4
Older versions of sbt are not supported.
Any version number that starts with 0. is automatically recognized as Dotty by
the sbt-dotty plugin, you don't need to set up anything:
aVersion := "0.8.0-RC1"
If the latest release of Dotty is missing a bugfix or feature you need, you may
wish to use a nightly build. Look at the bottom of
https://repo1.maven.org/maven2/ch/epfl/lamp/dotty_0.8/ to find the version
number for the latest nightly build. Alternatively, you can set scalaVersion :=
dottyLatestNightlyBuild.get to always use the latest nightly build of dotty.
When porting an existing project, it's a good idea to start out with the Scala 2
compatibility mode (note that this mode affects typechecking and thus may
prevent some valid Dotty code from compiling) by adding to your build.sbt:
acOptions ++= { if (isDotty.value) Seq("-language:Scala2") else Nil }
Using the isDotty setting ensures that this option will only be set when
compiling with Dotty.
A tool to port code from Scala 2.x to Dotty is currently in development at https://github.com/scalacenter/scalafix
If your build contains dependencies that have only been published for Scala 2.x, you may be able to get them to work on Dotty by replacing:
libraryDependencies += "a" %% "b" % "c"
by:
libraryDependencies += ("a" %% "b" % "c").withDottyCompat(scalaVersion.value)
This will have no effect when compiling with Scala 2.x, but when compiling with Dotty this will change the cross-version to a Scala 2.x one. This works because Dotty is currently retro-compatible with Scala 2.x.
NOTE: Dotty's retro-compatibility with Scala 2.x will be dropped before Dotty is released, you should not rely on it.
Feel free to come chat with us on the Dotty gitter!